The gain resistor used to set the gain in most instrumentation amplifiers is in a low impedance path. Any component placed between the gain setting pins has current flowing through it and therefore the resistance of the component adds to the gain resistance. Typical solid-state switches have drain to source on-resistance which is not well matched from part to part, is nonlinear in relation to input voltage, and drifts with temperature, causing gain error and distortion at the output of the in-amp. This on resistance problem has made it difficult to build a precision programmable gain in-amp from a monolithic in-amp chip in the past. However, with the ICF topology, the switches can be placed in a high impedance sense path, eliminating the parasitic resistance effects.